Vote with your feet. The longer you stay, and the deeper in you click (url to url), the more implicit your assent.

Well, only my Mirimir persona uses this VM, with this VPN chain and exit IP. And I have Firefox delete all cookies at exit. So they don't get much from me, no matter what.

Any advice on economical methods for persona-specific VM chains? E.g. 5 personas times $X/month for a commercial VPN adds up quickly, not to mention the inconsistent reliability/transparency of VPN providers.

I use pfSense VMs as VPN gateways, so VPN chains are virtual networks. But you could do the same thing with physical routers. Given that most providers allow multiple connections, you just need a few accounts.

Let's say that you have accounts with two providers, VPNA and VPNB. So you always connect first to a VPNA server, and then through that to a VPNB server. Given that each provider likely has many servers, there are likely hundreds of possible chains. Not all of them will work well, for whatever reasons, but enough to be useful.